Ron-Ron Got aNew Birthday Tattoo -- Fist Pump!

12/14/2010 5:30 AM PST BY TMZ STAFF

Less than two weeks after Pauly Dgot some fresh ink, Ronnie from "Jersey Shore" spent some time under the gun and got his arm seriously tatted up.

Ronnie endured a six-hour session at Mario Barth's King Ink in Las Vegas earlier this week to complete his heaven and hell themed tattoo. Ronnie's on and off girlfriend, Sammi Sweatheart, was there as well.